USB type-c switching circuit
a switching circuit and type-c technology, applied in the field of usb type-c switching circuits, can solve the problems of loss that affects the adds additional loss within the signal path, and affects the signal integrity of high-speed signals, so as to reduce the area of the pcb, improve product performance, and reduce the cost of the system
Active Publication Date: 2018-02-01
REALTEK SEMICON CORP
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Benefits of technology
The USB Type-C switching circuit described in this patent allows for the signal path to be arranged inside the chip, eliminating the need for an external port switch. This improves the product performance, reduces system cost, and simplifies the design of the serial signal switch. Before the signal path is switched, the signal is converted from a serial signal to a parallel signal, making it easier to process and reducing the cost of the system.
Problems solved by technology
The external Port Switch or the Port Mux may result in additional loss within the signal path, such as the insertion loss and the return loss which results from bad impedance match.
These losses badly affect the signal integrity of the high-speed signal, such as a DisplayPort1.x signal or a USB3.x signal.
The current high speed signal transmission technology requires a higher transmission speed, such as 10 Gbs for the USB3.1 version, but the higher transmission speed makes the signal transmission more affected by the above losses.
This problem is a challenge for the chip designers, and also the users have bad user experiences.
To sum up, the external Port Switch or Port Mux may make the common USB Type-C products meet the above requirements, but there are still problems left.
Method used
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[0016]The aforementioned illustrations and following detailed descriptions are exemplary for the purpose of further explaining the scope of the instant disclosure. Other objectives and advantages related to the instant disclosure will be illustrated in the subsequent descriptions and appended drawings.
[0017]It will be understood that, although the terms first, second, third, and the like, may be used herein to describe various elements, but these elements should not be limited by these terms. These terms are only to distinguish one element or region from another element or region. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of example embodiments of the present invention. As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items.
[0018]These are embodiments provided for illustrating the USB Type-C switching circu...
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Disclosed is a USB Type-C switching circuit configured for arranging a plurality of signals of a USB Type-C connector. The USB Type-C switching circuit can be used in products having DisplayPort Alternate mode, and includes a plurality of signal receivers / receivers, a plurality of series-parallel transforming circuits and a multiplexer. The signal receivers / receivers are connected to the USB Type-C connector to receive / transmit signals. The series-parallel transforming circuits are connected to the signal receivers / receivers to convert the signals between a parallel domain and a serial domain. The multiplexer is connected to the series-parallel transforming circuits to arrange the signals in the parallel domain according to a control signal.
Description
BACKGROUND OF THE INVENTION1. Field of the Invention[0001]The instant disclosure relates to a USB Type-C switching circuit. By having this USB Type-C switching circuit, when using a USB Type-C connector, the signal path can be arranged without an external Port controller or a Port Mux. In this manner, signal integrity can be improved, the system cost can be reduced and the product can have a smaller volume.2. Description of Related Art[0002]Currently, the USB Type-C products at least meet two requirements. One is to allow a USB Type-C connector to be plugged in in a reverse plug orientation. The other one is that, in the DisplayPort Alternate Mode on USB TYPE-C, a USB 3.x signal and a DisplayPort signal should be able to be transmitted at the same time. Usually, an external Port Switch or a Port Mux is used to meet the above two requirements. FIG. 2 shows how the Port Switch or the Port Mux works.[0003]The Port Switch or the Port Mux is mainly used to arrange the signal path of the ...
Claims
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IPC IPC(8): G06F13/38G06F13/42G06F13/40
CPCG06F13/385G06F13/4282G06F13/4022G06F13/4295G06F2213/0042
Inventor CHUANG, BING-JUOCHANG, FENG-CHENG
Owner REALTEK SEMICON CORP